Buick LeSabre 1965 Service Manual page 499

STEERING GEAR, STEERING COLUMNS A N D LINKAGE
POWER STEERING 8 - 3 5
CAUTION: Because the clearance
between the spool and valve body
is very small, extreme care must
be taken when assembling these
parts.
5. Place Seal Protector J-6222
over stub shaft and slide valve
spool spring over stub shaft with
smaller diameter coil going over
end of shaft last. See Figure
8-45. Work spring on shaft with
a small screwdriver until small
coil of spring is seated in the
stub shaft groove. Be careful not
to damage surface of shaft.
NOTE: Spring must be seated
properly in groove in stub shaft.
6. Lubricate a new cap to worm
" O " ring seal in automatic trans-
mission oil and install in valve
body.
NOTE: If during the assembly of
the valve, the stub shaft and valve
cap were allowed to slip out of
engagement with the valve body
pin, the spool will be permitted
to enter the valve body too far.
The spool dampener " O " ring
seal will expand into the valve
body oil slots and will prevent
withdrawal of the spool. If this
has occurred, attempt to with-
draw spool with a slight pull and
much rotary motion. If this does
not free the spool make sure
spool is free to rotate and place
valve body on a flat surface with
notched end up. Tap spool with
wooden or plastic rod until "O"
ring seal is cut and spool can be
removed. Install new dampener
" O " ring seal and proceed with
assembly as before starting with
Step 2 above.
g. Installation of Rotary Valve
Assembly and Adjuster
Plug Assembly
1. Align the narrow pin slot on
the valve body with the valve body
drive pin on the worm. Insert the
valve assembly i n t o the gear
housing by pressing against the
valve body with the finger tips.
Do not press on stub shaft or tor-
sion bar. See Figure 8-46. The
return hole in the gear housing
s h o u l d be fully visible when
valve is assembled properly. See
Figure 8-47.
CAUTION: Do not push against
the stub shaft during assembly as
this may cause the stub shaft and
cap to pull out of the valve body,
a l l o w i n g the spool dampener
" O " ring seal to slip into valve
body oil grooves. Be sure valve
is properly seated before install-
ing adjuster plug assembly.
2. Place Seal Protector J-6222
over end of stub shaft. Install
adjuster plug assembly in gear
housing snugly with adjustable
Spanner Wrench J-7624 then back
plug off approximately 1/8 turn.
Install adjuster plug lock nut if
removed, but do not tighten.
3. Adjust the thrust bearing pre-
load. A t t a c h T o r q u e Wrench
J-5853 with a 3/4 inch socket
to the stub shaft. Turn stub shaft
to approximately 1/2 turn from
either extreme. Slowly r o t a t e
wrench in an arc approximately
60° (1/6 turn) in both directions
several times to measure valve
drag. See F i g u r e 8-32. Then
tighten adjuster plug until thrust
bearing preload is 1 to 3 inch
pounds in excess of valve drag
measured with a d j u s t e r plug
backed out. Total of thrust bear-
ing preload and drag should not
exceed 11 inch pounds.
4. Tighten adjuster p l u g lock
nut with adjustable S p a n n e r
Wrench J-7624. Recheck thrust
bearing preload to be sure that
tightening lock nut did not change
adjustment.
8 - 1 5 DISASSEMBLY,
INSPECTION AND
REASSEMBLY OF
PITMAN SHAFT
ASSEMBLY
a. Removal of Pitman Shaft
Assembly
1. Thoroughly clean exterior of
gear assembly with a suitable
solvent. Drain the unit by placing
the valve ports down and turning
the worm through its entire range
two or three times.
2. Place gear assembly in vise.
3. Rotate the stub shaft until pit-
man shaft gear is in center posi-
tion. Remove the housing side
cover retaining bolts.
4. Tap the end of the pitman shaft
with a soft mallet and slide shaft
out of housing.
Figure 8-48—Removing Pitman Shaft
Needle Bearing
Figure 8-49—Checking Torque on
Lash Adjuster